EP2104079A1 - Procédé et alarme sonore, notamment détecteur de fumées - Google Patents

Procédé et alarme sonore, notamment détecteur de fumées Download PDF

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Publication number
EP2104079A1
EP2104079A1 EP09002913A EP09002913A EP2104079A1 EP 2104079 A1 EP2104079 A1 EP 2104079A1 EP 09002913 A EP09002913 A EP 09002913A EP 09002913 A EP09002913 A EP 09002913A EP 2104079 A1 EP2104079 A1 EP 2104079A1
Authority
EP
European Patent Office
Prior art keywords
alarm
acoustic signal
oscillations
measuring chamber
error
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09002913A
Other languages
German (de)
English (en)
Other versions
EP2104079B1 (fr
Inventor
Gerhard Röpke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Job Lizenz GmbH and Co KG
Original Assignee
Job Lizenz GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Job Lizenz GmbH and Co KG filed Critical Job Lizenz GmbH and Co KG
Publication of EP2104079A1 publication Critical patent/EP2104079A1/fr
Application granted granted Critical
Publication of EP2104079B1 publication Critical patent/EP2104079B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits
    • G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention relates to a method for testing the free entry of gas into a measuring chamber of a warning detector according to claim 1.
  • the invention further relates to a warning, in particular smoke detector according to claim 6.
  • a variety of different hazard or warning detectors have become known, all of which are based on detecting the entry of gas and / or smoke into a measuring chamber and giving a warning signal when a deviation from a desired condition is detected.
  • the warning signal can be emitted acoustically, visually or in another way.
  • Such danger or warning detectors are usually mounted on a wall and / or ceiling in buildings.
  • the detector device is located within the measuring chamber, for example an optical measuring device. So that no dirt or insects penetrate into the inlet openings to the measuring chamber, it is known to provide the openings with a grid or a sieve.
  • EP 1 870 866 or EP 1 857 989 It is known to examine the permeability of the inlet openings to the measuring chamber by optical means. However, if the inlet opening is closed with a protective film or an adhesive tape, this can not be determined with optical elements at the smoke inlet openings, since the covers are outside the danger detector.
  • Out DE 201 08 451 U1 an optical smoke detector is known which has a sound generator in the form of a piezoelectric element in the measuring chamber.
  • the sounder is used to generate an alarm sound, wherein the measuring chamber space is used as a sound box.
  • a monitoring of the inlet openings or a corresponding screen or grid at the inlet opening does not take place.
  • Out DE 8 210 633 U1 has become known a fire detector, in which the measuring chamber is equipped with a sound generator in the infrasonic range. Between the sound chamber and the Measuring chamber are provided with a plurality of communication openings, which are equipped with valves, so that the movement of the sounder membrane in the measuring chamber generates a negative pressure and the ambient air is sucked into the measuring chamber. As a result, smoke particles can enter the measuring chamber, which move only slowly in the ambient air of the smoke detector. A measurement of the contamination of inlet openings in the measuring chamber does not take place.
  • the invention has for its object to provide a method for testing the free entry of gas through at least one opening in a measuring chamber of a warning or hazard alarm, which is simple and safe Kunststofffiihrbar, even by automatic means, and does not affect the environment.
  • the number of oscillations after a termination of the acoustic signal is measured and compared with a predetermined value.
  • the acoustic signal is generated for a short time.
  • a piezoelectric disk can be used as a sound generator.
  • the excitation phase for the sound generator can only be a few oscillations in the range of the resonance frequency.
  • the piezo disk is excited with 20 vibrations. This has the advantage that the test operation requires only minimal energy and the sound produced occurs at short notice. Thus, the sound is practically imperceptible and a test for people in the area not disturbing.
  • the invention is based on the recognition that after the end of the excitation phase the sound generator or the piezo disk continues to oscillate with a decreasing amplitude.
  • the decay of the amplitude is influenced by the resonance sequence, by the sound generator, the measuring chamber and the inlet openings. In other words, even inlet openings, which are partially or completely closed by dust or a foil, lead to a damping of the decay process of the piezoelectric element.
  • the decay phase is therefore more or less significantly shorter depending on the degree of impermeability of the inlet openings.
  • the number of oscillations after the end of the acoustic signal is therefore counted and compared with a predetermined value.
  • This predetermined value is, for example, the number of decaying oscillations in the new or unpolluted state of the alarm. This value is stored in a suitable circuit of the alarm and is in the test mode the measured number of vibrations compared with the stored value. If the difference exceeds a predetermined value, an error signal is generated.
  • the acoustic signal is preferably generated cyclically according to one embodiment of the invention. After each acoustic signal, the measurement of the number of decaying vibrations takes place after its end.
  • the invention also relates to a warning indicator, which is characterized in that a control device for the excitation of a sounder interrupts the control of the sounder and a counter in an error measuring device counts the number of decaying vibrations after the interruption of the excitation of the sounder and the error measuring device generates an error signal if the vibration number is below a predetermined value.
  • the sound generator is preferably a piezo disk. It is according to a further embodiment of the invention behind an opening in an upper wall of the measuring chamber.
  • the sound generator can be the sounder of the measuring device at the same time. It is known to equip such warning or hazard detector with a sounder, which emits an alarm tone when a danger is detected.
  • One according to the invention is to arrange the piezoelectric disk in the diagonal of an H-bridge circuit which is connected to an oscillator.
  • One according to the invention is to transform the oscillations into digital signals, the number of which then determines whether the inlet opening is still to be regarded as a free passage or not.
  • the threshold value which is reached or undershot, in order to indicate that the decay process has largely ended. If e.g. the threshold value is reached or undershot within a period of time which is shorter than the time required for a piezo disk to decay when the inlet opening is free, an error signal can also be generated.
  • a housing 65 made of plastic at 51 is attached to a base 52 which is fixed to a ceiling 10 in a manner not shown.
  • the housing 65 is held by a flange portion 64 which is connected to the base 52. Details of this will not be explained because they are well known.
  • a first wall portion 58 is attached, and a second parallel wall portion 53 is connected via struts 59, 60 with the first wall portion 58.
  • the lower wall portion 55 has an opening or a hole 69.
  • Above the hole in the space between the wall sections 58, 55 is a piezo disk 68 on a pedestal, which is supported on the wall section 55; the piezo disk projects laterally, as shown at 67.
  • a measuring chamber 54 is formed with an optical transmitter 56 and an optical receiver 57, as is well known for optical smoke detectors. Again, details are not given.
  • the optical Measuring device is located on a plate 62 which is arranged on the bottom of the measuring chamber 54. Toward the measuring chamber, lateral inlet openings 63 for air or gas can be seen. The gas enters approximately as indicated by arrow 66. As soon as aerosols in the gas or other particles change the reception of the light from the optical transmitter 56, an error signal is generated, as is known per se. The required electronic circuit is not shown.
  • the piezo disk 68 serves as a sound generator for generating a danger signal by the electronic hazard or warning signal circuit. Furthermore, the piezo disk 68 serves as a test element for the passage of the inlet openings 63 for gas. These are usually provided with a grid or screen (not shown) which prevents debris or insects from entering the interior of the metering chamber 54. But such screens or grids can become clogged or glued over time, if in the building room in which the detector is arranged, worked with color. With the help of a suitable circuit and the sounder 68 can be determined whether there is sufficient continuity. Such a circuit arrangement is in FIG. 2 to recognize.
  • FIG. 3 is indicated how the processor 18 briefly excites the oscillator 10.
  • the excitation time is indicated with t an and is eg 20 oscillations.
  • the frequency corresponds approximately to the resonance frequency.
  • the resonance frequency results from the resonance frequency of the piezo disk 68, from the volume and the nature of the measuring chamber 54 and the inlet openings 63.
  • the resonance frequency can be determined beforehand during the construction or during a test.
  • the piezo disk 68 is in the diagonal of an H-bridge circuit, which is not shown. If the excitation of the piezo disc 68 is terminated, it will continue to oscillate for a certain time with decaying amplitude, as shown in FIG FIG. 3 can be seen.
  • the cooldown is in FIG. 3 marked with t AB .
  • the vibrations of the piezo disc 68 are converted into digital signals, as in FIG FIG. 4 shown.
  • the counter 16 counts the number of pulses after the completion of the excitation of the oscillator 10.
  • the number of pulses is stored, which still occur in a newly produced detector after completion of the excitation of the oscillator 10.
  • a reduced permeability of the inlet openings 63 leads to an attenuation of this oscillation, so that the number of pulses is smaller.
  • S1 denotes in FIG. 2 the drive signal for the oscillator 10, S2, the parallel drive of the counter 16 and S3, the pulse signal from the counter 16. It is understood that the comparator 14 and counter 16 may be housed in the processor 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
EP09002913A 2008-03-19 2009-02-28 Procédé et alarme sonore, notamment détecteur de fumées Expired - Fee Related EP2104079B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008014991A DE102008014991B3 (de) 2008-03-19 2008-03-19 Verfahren und Warnmelder, insbesondere Rauchmelder

Publications (2)

Publication Number Publication Date
EP2104079A1 true EP2104079A1 (fr) 2009-09-23
EP2104079B1 EP2104079B1 (fr) 2011-10-12

Family

ID=40340330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09002913A Expired - Fee Related EP2104079B1 (fr) 2008-03-19 2009-02-28 Procédé et alarme sonore, notamment détecteur de fumées

Country Status (4)

Country Link
US (1) US20090267755A1 (fr)
EP (1) EP2104079B1 (fr)
AT (1) ATE528737T1 (fr)
DE (1) DE102008014991B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11961380B2 (en) 2018-06-05 2024-04-16 Electronic Modular Services Ltd. Smoke chamber as audio chamber in audible alarm devices

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5222217B2 (ja) * 2009-04-24 2013-06-26 パナソニック株式会社 煙感知器
DE202009015335U1 (de) 2009-11-09 2010-03-25 Job Lizenz Gmbh & Co. Kg Gefahrenmelder
DE102009056268A1 (de) * 2009-12-01 2011-06-09 Techem Energy Services Gmbh Gefahrenmelder und Verfahren zur Erkennung von Gegenständen im Nahbereich des Gefahrenmelders
US10788458B2 (en) * 2016-02-05 2020-09-29 Msa Technology, Llc Detection of blockage in a porous member
US10983103B2 (en) 2018-11-23 2021-04-20 Msa Technology, Llc Detection of blockage in a porous member
WO2020232244A1 (fr) 2019-05-14 2020-11-19 Msa Technology, Llc Détection de blocage dans un élément poreux au moyen d'ondes de pression
EP4057247A1 (fr) 2021-03-08 2022-09-14 Carrier Corporation Procédé de détection de couvercle de détecteur d'incendie et appareil de détection d'incendie correspondant

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8210633U1 (de) 1982-04-15 1982-09-02 Dentan K.K., Tokyo Feuermeldegeraet
JPH02128298A (ja) 1988-11-09 1990-05-16 Nittan Co Ltd 検出器
DE4409900C1 (de) * 1994-03-23 1995-04-13 Preussag Ag Minimax Optischer Rauchmelder
JPH09196843A (ja) * 1996-01-19 1997-07-31 Fenwall Controls Of Japan Ltd 目詰り検出方法、目詰り検出装置、吸引式煙検知システム及び流速計
WO2001067072A1 (fr) * 2000-03-03 2001-09-13 Mine Safety Appliances Company Capteur de gaz
DE20108451U1 (de) 2001-05-19 2002-10-02 Job Lizenz Gmbh & Co Kg Optischer Rauchmelder
EP1857989A1 (fr) 2006-05-17 2007-11-21 Techem Energy Services GmbH Alerte d'incendie et procédé de vérification de sa capacité de fonctionnement
EP1870866A1 (fr) 2006-06-24 2007-12-26 Brunata Wärmemesser Hagen GmbH & Co. KG Détecteur de fumée

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3500969B2 (ja) * 1998-07-03 2004-02-23 株式会社日立製作所 電子スロットル制御装置
US6295001B1 (en) * 1999-06-14 2001-09-25 Jerry Keith Barber Tornado warning system
US6633202B2 (en) * 2001-04-12 2003-10-14 Gennum Corporation Precision low jitter oscillator circuit
US6696962B2 (en) * 2001-05-14 2004-02-24 John M. Kelly Resonant tube level sensor
US7791475B2 (en) * 2008-03-26 2010-09-07 Honeywell International Inc. Apparatus and method of blockage detection

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8210633U1 (de) 1982-04-15 1982-09-02 Dentan K.K., Tokyo Feuermeldegeraet
JPH02128298A (ja) 1988-11-09 1990-05-16 Nittan Co Ltd 検出器
DE4409900C1 (de) * 1994-03-23 1995-04-13 Preussag Ag Minimax Optischer Rauchmelder
JPH09196843A (ja) * 1996-01-19 1997-07-31 Fenwall Controls Of Japan Ltd 目詰り検出方法、目詰り検出装置、吸引式煙検知システム及び流速計
WO2001067072A1 (fr) * 2000-03-03 2001-09-13 Mine Safety Appliances Company Capteur de gaz
DE20108451U1 (de) 2001-05-19 2002-10-02 Job Lizenz Gmbh & Co Kg Optischer Rauchmelder
EP1857989A1 (fr) 2006-05-17 2007-11-21 Techem Energy Services GmbH Alerte d'incendie et procédé de vérification de sa capacité de fonctionnement
EP1870866A1 (fr) 2006-06-24 2007-12-26 Brunata Wärmemesser Hagen GmbH & Co. KG Détecteur de fumée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11961380B2 (en) 2018-06-05 2024-04-16 Electronic Modular Services Ltd. Smoke chamber as audio chamber in audible alarm devices

Also Published As

Publication number Publication date
EP2104079B1 (fr) 2011-10-12
US20090267755A1 (en) 2009-10-29
DE102008014991B3 (de) 2009-03-12
ATE528737T1 (de) 2011-10-15

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